Two-stage flash evaporator capable of improving waste steam utilization efficiency for waste heat generation in cement kiln

Abstract

The invention relates to a two-stage flash evaporator for a waste heat generating system in a cement kiln, particularly to a two-stage flash evaporator capable of improving the waste steam utilization efficiency for the waste heat generation in a cement kiln. Two flash evaporators in cascade connection; a coal economizer is connected with the water inlet of the first-stage flash evaporator through a pipeline; the water outlet of the first-stage flash evaporator is connected with the water inlet of the second-stage flash evaporator; the water outlet of the second-stage flash evaporator is connected with a boiler feedwater pump; and the steam outlets of the first-stage and the second-stage flash evaporators are communicated with the rear stage of the turbine for acting. The two-stage flash evaporator is characterized in that the two-stage flash evaporator has simple structure and low cost, is convenient to operate, is suitable for the large-amplitude fluctuation of the waste heat parameters in the cement kiln, can enable the low-grade heat source to obtain the maximum generation power, can control the exhaust temperature of the boiler to the range about 90 DEG C, improves the heat utilization rate of the low-temperature smoke, and achieves the purpose of utilizing the energy to the maximum degree.

Description

technical field [0001] The invention relates to a two-stage flash evaporator in a cement kiln waste heat power generation system, in particular to a two-stage flash evaporator capable of improving the utilization efficiency of waste gas in the cement kiln waste heat power generation system. Background technique [0002] As we all know, saving energy is an established long-term policy of our country, among which the utilization of waste heat is the most active and effective means. In many fields of existing industries in our country, the utilization of waste heat in the production process has attracted attention. In recent years, a large number of new process equipment and production lines have been invested in the transformation of the cement industry, and it is equipped with a pure medium and low temperature cement waste heat power generation system. In practical applications, due to the characteristics of the process, most of the parameters of the process waste heat flue g...

AI Technical Summary

Problems solved by technology

Moreover, the fluctuation range often exceeds the self-adjusting range of conventional waste heat power generation system design, making the waste heat power generation system unable to operate stably

Some fluctuations are even so large that the usual waste heat power generation system is forced to disconnect and shut down, and the economic benefits of waste heat recovery cannot be guaranteed

At present, although some cement plants have introduced waste heat power generation systems with flash evaporators, which have the ability to actively adjust and resolve the influence of process flue gas instability, there are obvious defects because most of these cement plants use single-stage flash evaporators. The steam waste heat power generation system cannot adapt to the large-scale flue gas fluctuations of the cement kiln, and cannot guarantee the stable operation of waste heat power generation. Moreover, the temperature of the hot water discharged from the outlet of the flash evaporator is still high, and the heat source has not been fully utilized.

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